Friday's session continued the interrogation on the Rishon Tours case, dubbed "Olmertours," in which police allege multiple billings of public institutions for Olmert's trips abroad, with the extra funds used for his personal travel.

Detectives also questioned the prime minister on the Cremieux Street case, involving the terms under which he purchased the family's Jerusalem residence and on another case in which Olmert allegedly granted favors to a company represented by his former business partner and close friend, attorney Uri Messner, during his tenure as industry, trade and labor minister.

On Thursday, former chief investigator of the National Fraud Unit, Dep. Cmdr (ret.) Boaz Guttman, told The Jerusalem Post that the prime minister was "playing for time."

"Olmert's evasive techniques are a constant," the former Fraud Unit chief said. "Techniques like writing down the detectives' questions [recorded on videotapes of previous sessions] and asking for each question to be repeated do not allow enough time for police to complete the interrogation," Guttman said.

Setting up technical equipment to record each session is also time-consuming, Guttman said.

"It's like a TV crew coming in. The logistics of setting up the cables take up the first five minutes," he said.

The prime minister allows two hours for the session, citing scheduling, though last week's session went an extra 45 minutes and this week's an extra hour.